Honda-SOHC

Other Stuff => Misc / Open => Topic started by: Nurse Julie on September 19, 2019, 08:06:54 PM

Title: Phenolic Brake Pistons
Post by: Nurse Julie on September 19, 2019, 08:06:54 PM: Has anyone ever heard of brake pistons made from Phenolic, or is it just me that has never heard of them?

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Title: Re: Phenolic Brake Pustons
Post by: hairygit on September 19, 2019, 08:24:04 PM: Yep, phenolic resin, there was a guy on the U.S. Site used to machine down GM car brake pistons to fit our Honda's, synthetic plastic, doesn't corrode, so should never seize!

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Title: Re: Phenolic Brake Pistons
Post by: Nurse Julie on September 19, 2019, 08:50:12 PM: Ah, ok. There is a chap selling them in USA and says they will last forever, will not transfer heat from the pad to the fluid and are a fraction of the weight. $44 though + post.
Title: Re: Phenolic Brake Pistons
Post by: Woodside on September 19, 2019, 08:51:35 PM: Is that the same stuff they also made sprockets out of
Title: Re: Phenolic Brake Pistons
Post by: mike the bike on September 19, 2019, 09:09:49 PM: And they don't expand ad much as metal.
Title: Re: Phenolic Brake Pistons
Post by: K2-K6 on September 19, 2019, 09:18:10 PM: Quote from: Woodside on September 19, 2019, 08:51:35 PM
Is that the same stuff they also made sprockets out of

I think so. Phenolic resin bonded cotton weave. Coarse weave for strength like above, fine weave gives more machinability and precision like the brake pistons.

Also all the brown coloured circuit boards are generally made of the same. Often called "mica"
Title: Re: Phenolic Brake Pistons
Post by: mike the bike on September 20, 2019, 07:16:46 PM: PCBs are either fibre glass or SRBP; synthetic resin bonded paper. Not to be confused with the cotton filled stuff that sprockets are made of.